Tanning board



Dec. 28, 1937. E.. A. HEADLAND TANNING BOARD Filed Jan. 4, 1936 www m i INVENTOR.

Bym( l d ATTORNEY.

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I Patented 28, 1937 v -PATENT oFFlcE TANNiNG BOARD Edwin A. Headland, Beaver, Pa., assigner to Ingram-Richardson, Manufacturing Beaver Falls, Pa., a vania Company, corporation of Pennsyl- Application January 4, 193s, serial No. 51,484

f s Claims.

My invention relates tothe stretching and drying of hides and skins, and consists in a new and improved board upon which the hides are pasted before they are passed through the drying chamber. 'Usually these boards, with the hides pasted to either side thereof areysuspended -in avertical position from conveyers which carry the hides through the drying chamber at the proper speed, and the dry hides are stripped oif the board after they emerge from the drying chamber. y

My invention includes among its objects and advantages: first, lightness, which is important on account of the handling required; second, freedom from breakage or deterioration; thirdr immunity from chemical action or corrosion; fourth, a surface hard enough and at the same time tough enough .to be substantiallyim'mune from mechanical abrasion; and fifth, the surface 'property by vreason of which the proper action of the adhesive can be easily obtained and accurately controlled.

I am aware that with respect to any one of these ilve criteria, fairly satisfactory boards are i known'in the priorart, but all the prior art plates of which I have knowledge are markedly deficient in one or more of the requirements. For instance, plates according' to prior art Patents 1,118,813 and 1,808,306, while`not at all unsatisfactoryjas to the first and third requirements, are materially less effective than plates according to the present invention with respect to the fifth requirement, and hopelessly inferior with respect to the second and fourth requirements .because the action of the leather and adhesive lobsens the outermost layers or laminations of the plates, and this action necessitates frequent and'extensive repairs. throughout the life of the plate. y

My improved boards are formed vof lsheets of' 4ferrous metal such as steel, preferably steel which, from its relatively low carbon content, is l known as soft steel, and the side `surfaces are coated with fused vitreous enamel. f Irrthe 'accompanying drawing, whereinI illustrate a practical embodiment of the prin'- ciples ofmy invention, Fig. 1 is aside elevation of one of my improved' drying boards; Fig. 2, is an enlarged sectional View taken'along of the frame to the board. l l s Fig. 3 is an enlarged fragmentary elevation showing a corner structure.

Fig. 4 is an enlarged fragmentary cross-sectional view of the board.

the line 2-2 in-Fig. 1, showing the attachmen A (ci. 149-12) A Referring in detail to the drawing, I represents the board proper which is formed of a steel sheet, preferably soft steel and of the desired thickness, such for instance as one-six-7 teenth of an inch. The sheets are cutto theproper dimensions. l

Each side of the sheet is-provided with two or more coats 2 f vitreous .enamel,.as indicated in Fig. 4, and each coat is separately fused.

Each coat may be applied in the usual manner as by brushing, spraying or dipping, and then fused before-the next coat is applied.

The enamel maybe of any suitable composition of ceramic, commonly referred to as glass, porcelain, or china when not affixed to metal, and as enamel when-affixed to a metal support. The minor variations of composition necessary lto secure ceramics best adapted for different types of service are wellv known in the art, and per se form no part of the present invention.

Before the outer coat or coats are fused, it or they are brushed off around the margin of the plate, as indicated at `3 in Fig. 4, so that.l when the frame 4 is secured in place it engages only the more thinly enameled portions of the' plate land thus obviates any tendency of the enamel to crack or craze at the junction of the plate l with the lframe.. i

To strengthen and stiffen the plate and render it more convenient for hand1ing,'and also tol prevent'contact between the enameled surfaces of adjacent plates orbetween hides pasted on adjacent plates, I provide suitable frames for` the plates, which frames are of greater width than the plate and thus protect the' latter. The framel is also of greater width than the combined width of the plate and the hides pasted on both sides of the plate, thus protectingl the hides' from contact.

`The frame may be formedintegrall'y with the sheet as by Vforming the metal of the sheet to the desired shapebefore enameling.

However, as the preferable type I yhave provided a frame formed by bending up sheet steel to vform a frame having a hollow box cross-sectional shape with two inwardly extending parallel lips 5 between which'theedge of the' plate is stiifened and reenforced by internal angle plates 8 which are welded or otherwise secured in place to bridge the joints. l

f In actual practice the use of my improved plates have proved to be attended by greatly improved results. -The enameled faces of the, plates are permanent and present smooth even surfaces to which the hides may be quickly and conveniently pasted. No Wrinkling occurs as the enamel quickly and evenly distributes the heat as the temperature of the plate rises. Again the enamel resists the attack of acids. The plates are strong and durable and are easy and con- 'venient to handle.l

Without further elaboration, the foregoing will so fully explain my invention that others may,

'by applying knowledge current at the time of application, readily adapt the same for use under various conditions of service.

1. A support for leather drying comprising a thin metal plate, and vitreous enamel fused in multiple layers in equal thicknesses on opposite sides of said plate and presenting the unaltered fused surface of the enamel to the leather.

2. A support for leather drying comprising a thin metal plate, and vitreous enamel fused on both sides of said plate and presenting the'unaltered fused surface of the enamel to the leather.

3. A support for leather drying comprising a thin metal plate, and vitreous enamel fused on both sides of said plate and presenting .the unaltered fused surface of the enamel to the leather, said unaltered fused enamel surface being smooth and uniform but not plane.

EDWIN A. HEADLAND. 

